TV Tonight: 'Grimm' airs episode that was pre-empted last week

View full size"Grimm" returns with a new episode tonight, well, actually, it's the episode that was scheduled last week, but Nick (David Giuntoli) is still in danger.Scott Green/NBC

"Grimm": As many viewers noticed last Friday, the scheduled new episode didn't air and was replaced by a rerun. NBC coverage of news events in Boston bumped the episode, but it's back on the schedule tonight.

Just to keep us on our toes, last week the episode was called "Ring of Fire." For some reason, it's now titled "Volcanalis."

Oh, NBC. Make things difficult, why don't you?

So get ready for a Wesen who gets inflamed when anybody messes with volcanic rock from his mountain. But don't get too comfortable: "Grimm" is moving to Tuesdays at 10 p.m. for a while, starting next week. (9 p.m. NBC/8)